Forums Bug Reports Topics longer than 390 characters being truncated

Confirmed. Typing /topic #channel <long topic> gets "less" truncated than doing it from channel central, but both get truncated.

And 005 from the network is:
zelazny.freenode.net dancer-ircd-1.0.32 aAbBcCdDeEfFGhHiIjkKlLmMnNopPQrRsStUvVwWxXyYzZ0123459*@ bcdefFhiIklmnoPqstv
MODES=4 MAXCHANNELS=20 NICKLEN=16 USERLEN=10 HOSTLEN=63 TOPICLEN=450 KICKLEN=450 CHANNELLEN=30 KEYLEN=23 CHANTYPES=# PREFIX=@+ CASEMAPPING=ascii CAPAB IRCD=dancer are available on this server

So it is definately mIRC.